from The American Heritage® Dictionary of the English Language, 4th Edition
- Four: tetrode.
- Containing four of a specified kind of atom, radical, or group: tetrachloride.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Forming compound words having the sense of ‘four’.
from the GNU version of the Collaborative International Dictionary of English
- A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.
- A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide.
from The Century Dictionary and Cyclopedia
- n. A prefix in compounds derived from the Greek, signifying ‘four’: as, tetrachord, tetragon, tetrarch, tetramerous, tetrapetalous, tetraspermous.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. brightly colored tropical freshwater fishes
Greek.(American Heritage® Dictionary of the English Language, Fourth Edition)
From combining form of Ancient Greek τέτταρες (tettares), τέσσαρες (tessares, "four"). (Wiktionary)